Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas ofertas houve para a porcentagem de vitórias de .500 na conferência do Vale do Ohio?
 ###Tabelas: CREATE TABLE south_australia (south_australia_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Coach VARCHAR, Home Ground VARCHAR, Location VARCHAR, Founded INT) CREATE TABLE canadian_wildlife_series (canadian_wildlife_series_id AUTO_INCREMENT PRIMARY KEY, Year INT, Animal VARCHAR, Artist VARCHAR, Finish VARCHAR, Mintage INT, Issue Price VARCHAR) CREATE TABLE overlap_between_multiple_social_network_services (overlap_between_multiple_social_network_services_id AUTO_INCREMENT PRIMARY KEY, Site VARCHAR, Bebo INT, Facebook INT, Friendster INT, LinkedIn INT, MySpace INT, Ning INT, Orkut INT, Plaxo INT) CREATE TABLE list_of_princesses_royal (list_of_princesses_royal_id AUTO_INCREMENT PRIMARY KEY, Order INT, Name dates VARCHAR, Princess Royal from (date) to (date) VARCHAR, Parent VARCHAR, Date married VARCHAR, Husband dates VARCHAR) CREATE TABLE record_by__conference (record_by__conference_id AUTO_INCREMENT PRIMARY KEY, Conference VARCHAR, # of Bids INT, Record VARCHAR, Win % VARCHAR, Round of 32 VARCHAR, Sweet Sixteen VARCHAR, Elite Eight VARCHAR, Final Four VARCHAR, Championship Game VARCHAR)  
SELECT SUM # of Bids FROM record_by__conference WHERE Win % = .500 AND Conference = ohio valley